Question for BEA /BA BAC 1-11 and Trident avionics engineers
I've picked up two or three old Amplivox Astrolite headsets in the last year or so. I think they're ex-BEA judging by the 'Bea' or 'Cea' lettering embossed on them (they also have 'W.R.721). Anyway, none of them have amplified microphones or carbon microphones which I thought was the standard for all civil aircraft.
Did these ex-BEA aircraft, or any others for that matter, have non-standard radios fitted, designed for use with ordinary dynamic or electromagnetic microphones ? Or have I got it wrong ?